The thermite reaction is represented by 2 Al (s)+ Fe _2 O _3(s) 2 Fe (l)+ Al _2 O…

CHEMISTRY · Single correct · A Level · Chemistry · Energetics · Energetics

Problem

The thermite reaction is represented by

2\text{Al}(s)+\text{Fe}_2\text{O}_3(s)\rightarrow2\text{Fe}(l)+\text{Al}_2\text{O}_3(s)\;\;\;\Delta H=-8.51\times10^{2}\,\text{kJ per reaction as written}

A mixture containing

10.0\,\text{g}

\text{Al}

and

15.0\,\text{g}

\text{Fe}_2\text{O}_3

is ignited. Assuming the reaction goes to completion, what quantity of heat is released? (a)

-3.15\times10^{2}\,\text{kJ}

(b)

-8.00\times10^{1}\,\text{kJ}

(c)

+8.00\times10^{1}\,\text{kJ}

(d)

-1.60\times10^{2}\,\text{kJ}